10210100021 has 4 divisors (see below), whose sum is σ = 11138290944. Its totient is φ = 9281909100.

The previous prime is 10210100003. The next prime is 10210100027. The reversal of 10210100021 is 12000101201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10210100021 - 2¹⁸ = 10209837877 is a prime.

It is a super-2 number, since 2×10210100021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10210099981 and 10210100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10210100027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464095445 + ... + 464095466.

It is an arithmetic number, because the mean of its divisors is an integer number (2784572736).

Almost surely, 2^10210100021 is an apocalyptic number.

10210100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10210100021 is a deficient number, since it is larger than the sum of its proper divisors (928190923).

10210100021 is an equidigital number, since it uses as much as digits as its factorization.

10210100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928190922.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10210100021 its reverse (12000101201), we get a palindrome (22210201222).

The spelling of 10210100021 in words is "ten billion, two hundred ten million, one hundred thousand, twenty-one".